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diff --git a/v_windows/v/old/examples/sokol/06_obj_viewer/show_obj.v b/v_windows/v/old/examples/sokol/06_obj_viewer/show_obj.v
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+/**********************************************************************
+*
+* .obj viewer
+*
+* Copyright (c) 2021 Dario Deledda. All rights reserved.
+* Use of this source code is governed by an MIT license
+* that can be found in the LICENSE file.
+*
+* Example .obj model of V from SurmanPP
+*
+* HOW TO COMPILE SHADERS:
+* - download the sokol shader convertor tool from https://github.com/floooh/sokol-tools-bin
+*
+* - compile the .glsl shader with:
+* linux  :  sokol-shdc --input gouraud.glsl --output gouraud.h --slang glsl330
+* windows:  sokol-shdc.exe --input gouraud.glsl --output gouraud.h --slang glsl330
+*
+* --slang parameter can be:
+* - glsl330: desktop GL
+* - glsl100: GLES2 / WebGL
+* - glsl300es: GLES3 / WebGL2
+* - hlsl4: D3D11
+* - hlsl5: D3D11
+* - metal_macos: Metal on macOS
+* - metal_ios: Metal on iOS device
+* - metal_sim: Metal on iOS simulator
+* - wgpu: WebGPU
+*
+* you can have multiple platforms at the same time passing parameters like this: --slang glsl330:hlsl5:metal_macos
+* for further infos have a look at the sokol shader tool docs.
+*
+* ALTERNATIVE .OBJ MODELS:
+* you can load alternative models putting them in the "assets/model" folder with or without their .mtl file.
+* use the program help for further instructions.
+*
+* TODO:
+* - frame counter
+**********************************************************************/
+import gg
+import gg.m4
+import gx
+import math
+import sokol.sapp
+import sokol.gfx
+import sokol.sgl
+import time
+import os
+import obj
+
+// GLSL Include and functions
+
+#flag -I @VMODROOT/.
+#include "gouraud.h" #Please use sokol-shdc to generate the necessary rt_glsl.h file from rt_glsl.glsl (see the instructions at the top of this file)
+
+fn C.gouraud_shader_desc(gfx.Backend) &C.sg_shader_desc
+
+const (
+	win_width  = 600
+	win_height = 600
+	bg_color   = gx.white
+)
+
+struct App {
+mut:
+	gg          &gg.Context
+	texture     C.sg_image
+	init_flag   bool
+	frame_count int
+
+	mouse_x  int = -1
+	mouse_y  int = -1
+	scroll_y int // mouse wheel value
+	// time
+	ticks i64
+	// model
+	obj_part &obj.ObjPart
+	n_vertex u32
+	// init parameters
+	file_name            string
+	single_material_flag bool
+}
+
+/******************************************************************************
+* Draw functions
+******************************************************************************/
+[inline]
+fn vec4(x f32, y f32, z f32, w f32) m4.Vec4 {
+	return m4.Vec4{
+		e: [x, y, z, w]!
+	}
+}
+
+fn calc_matrices(w f32, h f32, rx f32, ry f32, in_scale f32, pos m4.Vec4) obj.Mats {
+	proj := m4.perspective(60, w / h, 0.01, 100.0) // set far plane to 100 fro the zoom function
+	view := m4.look_at(vec4(f32(0.0), 0, 6, 0), vec4(f32(0), 0, 0, 0), vec4(f32(0), 1,
+		0, 0))
+	view_proj := view * proj
+
+	rxm := m4.rotate(m4.rad(rx), vec4(f32(1), 0, 0, 0))
+	rym := m4.rotate(m4.rad(ry), vec4(f32(0), 1, 0, 0))
+
+	model_pos := m4.unit_m4().translate(pos)
+
+	model_m := (rym * rxm) * model_pos
+	scale_m := m4.scale(vec4(in_scale, in_scale, in_scale, 1))
+
+	mv := scale_m * model_m // model view
+	nm := mv.inverse().transpose() // normal matrix
+	mvp := mv * view_proj // model view projection
+
+	return obj.Mats{
+		mv: mv
+		mvp: mvp
+		nm: nm
+	}
+}
+
+fn draw_model(app App, model_pos m4.Vec4) u32 {
+	if app.init_flag == false {
+		return 0
+	}
+
+	ws := gg.window_size_real_pixels()
+	dw := ws.width / 2
+	dh := ws.height / 2
+
+	mut scale := f32(1)
+	if app.obj_part.radius > 1 {
+		scale = 1 / (app.obj_part.radius)
+	} else {
+		scale = app.obj_part.radius
+	}
+	scale *= 3
+
+	// *** vertex shader uniforms ***
+	rot := [f32(app.mouse_y), f32(app.mouse_x)]
+	mut zoom_scale := scale + f32(app.scroll_y) / (app.obj_part.radius * 4)
+	mats := calc_matrices(dw, dh, rot[0], rot[1], zoom_scale, model_pos)
+
+	mut tmp_vs_param := obj.Tmp_vs_param{
+		mv: mats.mv
+		mvp: mats.mvp
+		nm: mats.nm
+	}
+
+	// *** fragment shader uniforms ***
+	time_ticks := f32(time.ticks() - app.ticks) / 1000
+	radius_light := f32(app.obj_part.radius)
+	x_light := f32(math.cos(time_ticks) * radius_light)
+	z_light := f32(math.sin(time_ticks) * radius_light)
+
+	mut tmp_fs_params := obj.Tmp_fs_param{}
+	tmp_fs_params.ligth = m4.vec3(x_light, radius_light, z_light)
+
+	sd := obj.Shader_data{
+		vs_data: unsafe { &tmp_vs_param }
+		vs_len: int(sizeof(tmp_vs_param))
+		fs_data: unsafe { &tmp_fs_params }
+		fs_len: int(sizeof(tmp_fs_params))
+	}
+
+	return app.obj_part.bind_and_draw_all(sd)
+}
+
+fn frame(mut app App) {
+	ws := gg.window_size_real_pixels()
+
+	// clear
+	mut color_action := C.sg_color_attachment_action{
+		action: gfx.Action(C.SG_ACTION_CLEAR)
+		value: C.sg_color{
+			r: 0.0
+			g: 0.0
+			b: 0.0
+			a: 1.0
+		}
+	}
+
+	mut pass_action := C.sg_pass_action{}
+	pass_action.colors[0] = color_action
+	gfx.begin_default_pass(&pass_action, ws.width, ws.height)
+
+	// render the data
+	draw_start_glsl(app)
+	draw_model(app, m4.Vec4{})
+	// uncoment if you want a raw benchmark mode
+	/*
+	mut n_vertex_drawn := u32(0)
+	n_x_obj := 20
+
+	for x in 0..n_x_obj {
+		for z in 0..30 {
+			for y in 0..4 {
+				n_vertex_drawn += draw_model(app, m4.Vec4{e:[f32((x-(n_x_obj>>1))*3),-3 + y*3,f32(-6*z),1]!})
+			}
+		}
+	}
+	*/
+	draw_end_glsl(app)
+
+	// println("v:$n_vertex_drawn")
+	app.frame_count++
+}
+
+fn draw_start_glsl(app App) {
+	if app.init_flag == false {
+		return
+	}
+	ws := gg.window_size_real_pixels()
+	gfx.apply_viewport(0, 0, ws.width, ws.height, true)
+}
+
+fn draw_end_glsl(app App) {
+	gfx.end_pass()
+	gfx.commit()
+}
+
+/******************************************************************************
+* Init / Cleanup
+******************************************************************************/
+fn my_init(mut app App) {
+	mut object := &obj.ObjPart{}
+	obj_file_lines := obj.read_lines_from_file(app.file_name)
+	object.parse_obj_buffer(obj_file_lines, app.single_material_flag)
+	object.summary()
+	app.obj_part = object
+
+	// set max vertices,
+	// for a large number of the same type of object it is better use the instances!!
+	desc := sapp.create_desc()
+	gfx.setup(&desc)
+	sgl_desc := C.sgl_desc_t{
+		max_vertices: 128 * 65536
+	}
+	sgl.setup(&sgl_desc)
+
+	// 1x1 pixel white, default texture
+	unsafe {
+		tmp_txt := malloc(4)
+		tmp_txt[0] = byte(0xFF)
+		tmp_txt[1] = byte(0xFF)
+		tmp_txt[2] = byte(0xFF)
+		tmp_txt[3] = byte(0xFF)
+		app.texture = obj.create_texture(1, 1, tmp_txt)
+		free(tmp_txt)
+	}
+	// glsl
+	app.obj_part.init_render_data(app.texture)
+	app.init_flag = true
+}
+
+fn cleanup(mut app App) {
+	gfx.shutdown()
+	/*
+	for _, mat in app.obj_part.texture {
+		obj.destroy_texture(mat)
+	}
+	*/
+}
+
+/******************************************************************************
+* events handling
+******************************************************************************/
+fn my_event_manager(mut ev gg.Event, mut app App) {
+	if ev.typ == .mouse_move {
+		app.mouse_x = int(ev.mouse_x)
+		app.mouse_y = int(ev.mouse_y)
+	}
+
+	if ev.scroll_y != 0 {
+		app.scroll_y += int(ev.scroll_y)
+	}
+
+	if ev.typ == .touches_began || ev.typ == .touches_moved {
+		if ev.num_touches > 0 {
+			touch_point := ev.touches[0]
+			app.mouse_x = int(touch_point.pos_x)
+			app.mouse_y = int(touch_point.pos_y)
+		}
+	}
+}
+
+/******************************************************************************
+* Main
+******************************************************************************/
+// is needed for easier diagnostics on windows
+[console]
+fn main() {
+	/*
+	obj.tst()
+	exit(0)
+	*/
+
+	// App init
+	mut app := &App{
+		gg: 0
+		obj_part: 0
+	}
+
+	app.file_name = 'v.obj_' // default object is the v logo
+
+	app.single_material_flag = false
+	$if !android {
+		if os.args.len > 3 || (os.args.len >= 2 && os.args[1] in ['-h', '--help', '\\?', '-?']) {
+			eprintln('Usage:\nshow_obj [file_name:string] [single_material_flag:(true|false)]\n')
+			eprintln('file_name           : name of the .obj file, it must be in the folder "assets/models"')
+			eprintln('                      if no file name is passed the default V logo will be showed.')
+			eprintln('                      if you want custom models you can put them in the folder "assets/models".')
+			eprintln("single_material_flag: if true the viewer use for all the model's parts the default material\n")
+			exit(0)
+		}
+
+		if os.args.len >= 2 {
+			app.file_name = os.args[1]
+		}
+		if os.args.len >= 3 {
+			app.single_material_flag = os.args[2].bool()
+		}
+		println('Loading model: $app.file_name')
+		println('Using single material: $app.single_material_flag')
+	}
+
+	app.gg = gg.new_context(
+		width: win_width
+		height: win_height
+		create_window: true
+		window_title: 'V Wavefront OBJ viewer - Use the mouse wheel to zoom'
+		user_data: app
+		bg_color: bg_color
+		frame_fn: frame
+		init_fn: my_init
+		cleanup_fn: cleanup
+		event_fn: my_event_manager
+	)
+
+	app.ticks = time.ticks()
+	app.gg.run()
+}